var a = document;
//var e = a.referrer;
var e = 'http://www.google.com.hk/search?hl=zh-CN&newwindow=1&safe=strict&q=w3ctech&aq=f&aqi=&aql=&oq=';

function f() {
 this.tags = {};
 this.clicks = [];
 this.getSt()
}
f.prototype = {
 sindex: [1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13],
 sengin: ["baidu.com", "baidu.com", "google.com", "google.cn",
 "sogou.com", "zhongsou.com", "search.yahoo.com", "one.cn.yahoo.com",
 "soso.com", "114search.118114.cn", "search.live.com", "youdao.com", "gougou.com", "bing.com"],
 sword: ["word", "wd", "q", "q", "query", "w", "p", "p", "w", "kw", "q", "q", "search", "q"],

 getValue: function(m, n) {
  var l = new RegExp("(^|&|\\?)" + m + "=([^&]*)(&|\x24|#)");
  var k = n.match(l);
  return k ? k[2] : ""
 },

 getSt: function() {
  var x = null;
  var k = e;
  var w = this.sengin;
  var u = this.sword;
  var q = this.sindex;
  for (var o = 0; o < w.length; o++) {
   if ((k.indexOf(w[o]) > -1) && (this.getValue(u[o], k))) {
    this.tags.sw = this.getValue(u[o], k);
    this.tags.se = q[o];
    this.tags.st = "2";
    return;
   }
  }
  return  this.tags;
 }
}
var b = new f();
alert(b.tags);
for (var k in b.tags) {
 alert(b.tags[k]);
 
}